Device fob operating- the bolt to obtain taper in shingle-machines



NITED STATES PATENT OFFICE.

E. MORGAN, OF MORGANTOWN, VIRGINIA.

DEVICE FOR OPERATING THE BOLT T0 OBTAIN TAPEIR. IN SHINGLE-MACHINES.

Specicaton of Letters Patent No. 20,501, dated June 8l, 1858.

To all whom 'it may concern:

Be it known that I, ELIJAH MORGAN, of Morgantown, in the county ofMonongalia and State of Virginia, have invented certain new and usefulImprovements in Machines for Sawing Shingles, Staves, Clapboards, orother Material from Bolts or Blocks of ITood; and I do hereby declarethe following to be a full, clear, and exact description of theconstruction and operation of the same, reference being had to theaccompanying drawings, making a part of this specification, in whichFigure l, represents a perspective view of the machine. Fig. 2,represents a cross section taken near the front end of the machine.

Similar letters of reference wheie they occur in the several figuresdenote like parts of the machine in all of them.

My invention relates to the arrangement of devices for adjusting, orchanging, the bed on which the bolt drops and receives its properposition for admitting of the proper shaped piece heilig sawed from it,whatever the :torni of that piece may be in its longiu tudinal or crosssection.

To enable others skilled in the art to make and use my invention, I willproceed to describe the same with reference to the drawings.

A, represents a frame constructed in any well known substantial manner.In this frame is hung a saw B, on a vertical shaft C.

D, D, are ways upon which a carriage E, may be traversed past the saw.The carriage E, is furnished with head blocks, dogs, and levers orhandles, for properly holding, clamping, and releasing the block, andtraversing it past the saw.

Underneath the front end ofthe frame, is hung an eccentric roller F, insupports Gr,

in which it may be raised or lowered, asl

may be required; and above this roller at each of its ends, are hingedat a, a, two swings H, which rest upon the roller F. The swings H, H,are hinged respectively to the plates I, I, which by means of slots andset screws underneath the rails J, J, can be moved to, or from thecenter of the machine.

On the side of the frame there is an arc or plate K, to which a switchL, is pivotedthe front part of the switch being just iush with a flangeZ9, turned on the edge or end of said plate K; and in this flange arenotches l, 2, 3, into which the lever c, that is fastened to one end ofthe eccentric roller F, may catch, when the switch L, is not so arrangedas to cover any one of said notches, in which latter case the notch ispractically removed, and the lever will pass by it, into the next oropen one-the switch acting to make the lever take such of the notches,as the character of the sawing to be done may require.

It will be perceived that, the roller F, is not only hung eccentrically,but that it stands oblique to the frame either horizontally orvertically throughout its entire rotationthough this may be said to bedue to its being eccentrically hung. The effect, of this mode of hangingthe roller F, is that while the ends of the roller in their rotation orvibration describe a large circle or arc-the center of the rollerrevolves within its diameter or in other words its center does not riseabove or fall below a iixed point. Now,

the center of the roller turning on a fixed point, and its ends turningin a much eX- tended circle-the nearer to the center the less will bethe rise and fall of' the perimeter of the roller, and consequently theJfarther from the center the greater will be the rise and fall, so thatas the swings H, are brought nearer to the center of the roller the lesswill they be elevated and depressed by it-and the less they are elevatedand depressed the less taper will be given to the shingle or boltadjusted upon them, and vice versa. The effect of this eccentric rolleris the same as though two frustums of cones were joined at their apices,and hung by ournals at their basis for the circle of rotation enlargesfrom the center or point of junction to the base.

When sawing shingles, and the swings are properly set on the roller F,the lever c, is changed at every throw from the notch l, to the notch 3,and vice versa. When sawing staves or heading, the lever is set at thenotch 2. When the notches 1-3, are being used the switch L, is let down,so as to allow it to slip past the notch 2 without catching.

Having thus :fully described the nature and object ofmy invention what Iclaim therein as new and desire to secure by Letters Patent is- Thecombination of the eccentric roller F, the swings H, H, and the lever,stop, and switch, substantially in the manner and for the purpose hereinset forth and described.

ELIJ AH MORGAN.

Witnesses:

PHILIP ROGERS, I. M. FoGLE.

